Devialet

Ircam Amplify

Antoine Petroff

Pierre-Emmanuel Calmel

Jean-Loup Afresne

Eduardo Mendes

Emmanuel David Nardin

Frédéric Amadu

Julien Laurent Bergere

Jean-Loup Nat Afresne

Pierre-Emmnanuel Calmel

A signal processing method transforms X input signals into M output signals. The method includes applying a decorrelation filter to the X input signals so as to generate N decorrelated signals e; and for each decorrelated signal edetermined, generating N delayed signals eby applying a delay τand a gain gto each decorrelated signal e, the delays τand the gains gbeing chosen. For each decorrelated signal e, the delayed signals esimulate a propagation of the decorrelated signal in a virtual space. The virtual space has N virtual loudspeakers and a virtual listening position that are distributed according to a predetermined geometry. For each value of k, summing the delayed signals e: E=Σe; and determining M output signals, each output signal resulting from a linear combination of the N sums of the delayed signals E.

Signal processing method

An acoustic system () for diffusing sound from N channels (Si) comprising audio frequencies, N being greater than or equal to two, the acoustic system comprising a frame (), M loudspeakers (HPj) which are similar to each other and mounted on the frame (), and a processing unit () designed to send M loudspeaker signals (SSj) to the loudspeakers respectively. The loudspeakers are arranged at an angle about an axis (Z), two successive loudspeakers forming an angle (a) substantially equal to 360&#xb0; divided by M. The processing unit () comprises a splitter () configured to produce the loudspeaker signals (SSj), each loudspeaker signal comprising the same shared bass component (SS) in which audio frequencies that are higher than a first predetermined frequency (f) are non-existent or reduced, at least two of the loudspeaker signals further comprising a specific component (SS) in addition to the shared bass component and in which the audio frequencies below the first frequency are non-existent or reduced, each specific component being obtained from at least one of the channels, and at least two of the specific components being different from each other.

Acoustic system with spatial effect

Loudspeaker enclosure comprising at least one loudspeaker having a convex mobile membrane, and a member surrounding the mobile membrane and comprising an external surface bounded by an internal edge (&#x393;') situated facing the mobile membrane, which comprises a peripheral edge (&#x393;) situated facing the internal edge of the member and forming a closed loop. The mobile membrane and the member have a suitable shape such that, over a continuous portion (&#x393;&#x2033;) of the peripheral edge (&#x393;) representing at least 25% of the length of the peripheral edge, for any first point (M) on the continuous portion and any second point (M&#x2032;) situated on the internal edge at a location such that the distance between the first point (M) and second point (M&#x2032;) is minimal, the mobile membrane has, at the first point, a first tangent plane, essentially coincident with a second tangent plane at the second point.

Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member

This electroacoustic conversion chain comprising at least one loudspeaker, this loudspeaker comprising means for generating a magnetic field in a magnetic circuit having an air gap and a membrane secured to turns of a conducting material which may move in this air gap, is characterized in that it comprises at least one control module comprising at least one input for conveying a signal to be broadcast and at least one output connected to a turn, the control module being able to apply to said or each output an excitation signal depending on the position of at least one turn relatively to the air gap.

Electroacoustic conversion chain with selectively powered coil

An electrodynamic loudspeaker () including: The assembly further comprises at least one connecting member () secured to the diaphragm, the second joint including a radially inner attachment point () attached on the connecting member, and a radially outer attachment point () attached on the chassis.

Compact electrodynamic loudspeaker having a convex diaphragm

The present invention relates to a device for controlling a loudspeaker () in an enclosure, comprising: It comprises a control unit comprising:

Device for controlling a loudspeaker

The present invention relates to a device for controlling a loudspeaker () in an enclosure, comprising: It comprises means () for calculating the excitation signal, means () for calculating a desired dynamic value (A) of the diaphragm of the loudspeaker based on the audio signal (S) to be reproduced and the structure of the enclosure, the means () for calculating the desired dynamic value (A) of the loudspeaker diaphragm being able to apply a correction that is different from the identity, and taking account of structural dynamic values (x, v) of the enclosure that are different from the only dynamic values relative to the loudspeaker diaphragm, and the means () for calculating the excitation signal of the loudspeaker being able to calculate the excitation signal based on the desired dynamic value (A) of the loudspeaker diaphragm.

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Paris, France

Antoine Petroff